SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480f96332e10ad6735e924d7f4631e5817c495d29cb4ba0cf9a063ee6aa65567' 
  AND token = 'UV7Qns4zUqVrJ8sgjBZQdrHQV5usYG+IpdolgjNmY6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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