SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed34368d349aa907fe5d5cb829ada9fd2a2881ddb3de4a2fd36ccc48a6a08005' 
  AND token = 'GyiKGZSXciJ4mOVo+IIWnrquFjIsznlx18QQGSB/BZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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