Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8462e11d35a27cd1484945b9e01ec4984fb0f587bd831dc66c5900405b158b43' 
  AND token = '8sfrAWkwGqNK9g3uQg42MXV3xxHDwFCBxIEhuX0RwL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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