SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1087fc413bc4f502a6c0e78432ea9a7874213165a4e8f207103d1b2292319146' 
  AND token = 'Itw5Zh4o9CKo5qNXPoxxeJF8ioUBjob+jhfzUUh+QQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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