SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa1798e104ae662ef2aac15343917cda2ae72b4b03a02f071edb952dac84246' 
  AND token = '6pZHJ1pRXTTbz45xWFMQHQifnAP/4mN4EW0B6XDRPxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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