SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f1f2de2dd04f89576365d993d93c89246eb1654c773ffcc18a9bd33516980c' 
  AND token = 'A6uzyXV6tPDDeHZMOMoA+jLNRspUGPlsyN3xIoIqekw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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