SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2057f5856a27905cfd0dc8f783dc87967aca93b04b79319233616249f5acd73f' 
  AND token = 'GiTkaUyzRVYRX+CZfzMqd2puROavdYfDudB25QVAjlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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