SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28768927cbafea1f4ae39768cb95c46301f16e09e8c54634df60bad15dbf00d' 
  AND token = 'ZREV9kvOTCBjK2mSX0NqQ9QjMywLwj3Y6xqVnlM3hr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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