SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e49191636c5c665d773c93f8be46bad6b5b4ff6e1233bc9f58a02a5aae640b' 
  AND token = 'ubgT+rykMIG/+cvZHVT8LPhE5HNZLU1KcgxR66dCJ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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