SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7281bb0c46ee2571e3b83bc1635d076f6072809d252d38d20fc51c1d0603901d' 
  AND token = 'KXqeTTOPOgGhBtJtpdbDo5alDM1WXV/mqiwv2VAxrQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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