SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05630bcc0598e57357347d04f36b8b53862d7672d6f55e7bde960425144b0418' 
  AND token = 'IpFKVJ7gn5v+VrwFNp3HBJpvwiGgHR23rg3ISdDgBYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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