SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5ab8e4679c24baf7636db4f8586c799fe1e7e84fe3bce01e1d02f8b26dad65' 
  AND token = 'seiwLpZUlMagY/xVIa0G9TcQMX5oTYByODqHkhfvZ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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