SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2442816eade2f393e027fd11acf0708ade2c519fc0b4bf2226faec211c54dbd5' 
  AND token = 'tlq+NkMBcUxVK8MuRLeMrZ7SEK/G2bgGScxcBkP9n3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

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