Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cf4efe19d13faffd6136d8b7c25f2d349069c0249ce8d9dafd63fb10524a8a' 
  AND token = 'et2gnsA9oPBI+TcwRnwpWsR/RoKz33Lf/P0bSHYIwMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}