The Driver by Ollie Wride (feat. The Night Hour) Music Video

The singer's keys can be seen throughout the music video.  His keychain is a steering wheel.
Watch the video here:

The Flash

From season 5 episode 6  Frank (The Elongated Man) and Cecille are investigating to find out who is Cicada.  They confront a corrupt FEMA official to get information from him.  Frank holds up his Lamborghini keychain as evidence he has been stealing money from the government.

From season 5 epsisode 10   A new villain (Silver Ghost) breaks Weather Witch out of prison.  She has a meta tech keychain.  A piece of the dark matter infused satellite apparently attached to a car keychain granting the holder the ability to control some technology (mostly cars.)

My Hero Academia

The class move into their new dorms and they look at each others rooms to see which one is best.  Tokoyami has a goth style room with a keychain to match.

The Saint

The Saint, with Roger Moore. S06_E07 "The Double Take"
The Saint is kept in a house against his will. He says he has to go home to get some clothes. The bad guy says "No way, the butler will go for you" (meaning "Give him your car keys")

Malcolm in the Middle

Malcom in the Middle S01E08 14'10". The big brother just met that girl at the school party. But they pretend they'd been living together for years and years. They have a fight and they give back things one to the other. For instance, she says "i give you back that awful ring you offered me", he answers "i give you back your silly keyring" etc

Kingsman: the Golden Circle

Behind a wall in his house, Eggsy (Taron Egerton) has his secret agent tools and weapons.  Among them are keychains with the Kingsman logo on them.

Silicon Valley

From season 5 episode 8.  The guys need to get somewhere fast so they take the Tesla that Dinesh, Kumail Nanjiani, is paying for but doesn't actually own.  The Tesla keychain is most likely an electronic key for the car.

The Path

From season 3 episode 6.  Sarah Lane's (Michelle Monaghan) keychain is appropriately the symbol for her religion, the eye with rays around it.  The keychain is a wooden eye inside a metal frame.

Cobra Kai

Johnny Lawrence (William Zabka) is passed out on his floor after an apparent binge.  His firebird keychain matches his car, most likely an attempt to continue to live as he did in the 80's.

Counterpart

From season 1 episode 9.  The counterparts are preparing for their infiltration and assault.  One of their keychains can be seen, they are a bottle opener and some kind of clip.

28 Weeks Later

The kids escape the quarantine zone and find a scooter so they can return to their old home.  The key to the scooter is on a corpse and has a yellow plastic fob attached.

Get Out

When things really turn sideways Rose Armitage (Allison Williams) shows her keys and enamel bear face keychain to her boyfriend, Chris Washington (Daniel Kaluuya), signaling her true intentions. 

Captain America Civil War

Peter Parker AKA SpiderMan (Tom Holland) comes home to find Tony Stark there.  His house keys have a keychain on them.  It appears to be a dog tag, or just a generic gray fob.

Logan

Logan and Laura steal a fisherman's truck to continue their journey.  The fisherman's keychain is of course a fish.
Laura has a horse keychain attached to her backpack.

Monk

From Season 1 Episode 1.  Adrian Monk's (Tony Shalhoub) keychain is a silver "T", it belonged to his late wife Trudy.  Adrian is at a funeral for a case, he is sitting in a balcony. He misplaces his keys but finds them in his pocket.  He is so happy he is swinging them on his finger but they slip and fall into the open casket.  He tries to fish them out unnoticed with dental floss and a paperclip but fails in hilarious fashion.

From season 1 episode 6.  Adrian is investigating the death of a billionaire who tried to mug a man.  The victim of the mugging has a keychain with his college fraternity on it Phi Beta Tao.  This becomes an important clue later on.