SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da92a18d4e2f5559ec191fbf573f5f437ff008ccfb22f7be7c261adb63a3f64' 
  AND token = 'Jedxh+mNQeO7njSXmIXs5Ro0ZqSLlkBMmPG/XqOvXtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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