Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acab3ff6f108416967a360bce0e581ddb7e71f6cc9a21754e519729793c5758' 
  AND token = '+yGLNYzOlEnHyDJekTqenTfymSaj+PI13wTsJ097pXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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