SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e30311b63b63ec3bb1801296f71aef82c79a4a51e09563703cba8e81d471494' 
  AND token = 'wWj+OqT+7TgVNUHyJByexYI/EtpJDSavG6ewHaanbKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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