Constantine

Constantine (Keanu Reeves) is performing an exorcism and he starts by attacking the demon with magical charms on his keychain.  They hurt the demon but it is far more powerful than he expected, foreshadowing a looming threat.  It is hard to make out details in the film but these pictures of the actual prop are quite clear.

Creed

Adonis Creed, son of Apollo Creed who was the best friend of Rocky Balboa, is desperately trying to get a trainer so he can become a professional boxer.  He storms his father's old training gym and puts up his car as a bet to any fighter who can beat him.  His keychain is a metal oval with the word racing on it. 

Sicario

Emily Blunt's character is blowing off steam by having a night out after her stressful mission.  The man who she is with raises her suspicions when he empties his pockets.  His basic electronic car fob can been seen on her coffee table.

Howling 2

From the notorious horror movie.  The main characters check into a hotel and behind the desk clerk a myriad of keychains can be seen.  Even the hotel must be cheap since the keychains are not consistent.