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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c8029085a26da5a90400089d79fdc481e64a5d1b1640de00070bb8a16ccb20' 
  AND token = 'ps5tsTfGiKpVLcxY6vtGbRJcCDMi9Gd00pDij96B4ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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