SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32100b67b5982d93b6f8547b8f28c2cac4b73a46eabb83ba74c833675d8f94a5' 
  AND token = '7+lulOgDovUxT+7gYqwWxtjsgAPDGL887dYpV2iz4q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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