SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e98f58744d56e1722bee472dfa34c665bd7feb23adf4fd54b9cc36c7477a35' 
  AND token = 'qoXwvZA/SrhtEcuA0G/IG2xbwnnoC8jFMqgF+/ncHwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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