SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcddba2d6d17385f135c4e4d9e6b39f610db5e8cbf91b9989dfbfaf9e533cd1a' 
  AND token = 'akjzqHd9KP9Ypz9TZrPVWSUNwGWvf+SZoaV/hnhXgl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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