SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d8b8135481f1666049ebe412ad2d794391f6b0536e65a00cbbaacbfef3573d' 
  AND token = 'J7OZn+8HBdlHKDpt3/wcaKIO75RQ/tDRASl+LyEFGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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