SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204dbd622fe21247a45a84fa27103bc1129acf6347a5d364a3008c63d2c0a91b' 
  AND token = 'f/HFDz6iHdMo7Bxc7qjvBfUgDGkORDyZk3FozXd+pGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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