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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318fc94d486d1861947a0aee9b0ad0af00e99b97f784b6a408201933e30b353f' 
  AND token = 'V4wOxAyUR28iF8jyZEdRY3cKxJDwyC5pLjTgOM7y/TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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