SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac914a76abf9ff7cc0e1c2d711e6cbaf327be3f84909cff1ec0bcf20cedc9e4' 
  AND token = '3z3vBLwj6z0+/ME0q8ROX/hAk81mgS0LEmpZpIQnVaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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