SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08851fffc0ae60652793c5fa33ee091b8cea0a61e21975761e7f528c7c14d9d7' 
  AND token = 'MtgySmnJHcE9eP+sO1miOsm7Vxvbxd2mXIaMb0yAHgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

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