SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8f418ba2c9021aa8daf52d3d94b9a43815116cda72d436920dc97df2fab453' 
  AND token = 'yEVJtXbZWIXyCDDEg/+saag9S0YOOh3IvRIk490s1Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables