SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2185c7db30a2bf8358f8cf6efdbbb30550d65cbe9c80c40fdb24e82e9c9db01' 
  AND token = '3Hvz6TwlWkYBAZUDgWfP8WpNjVjWgwOHkZ1pmUmLHKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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