SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d142813f4988b3799387c5f2b6997ec9d4fbe9529c13a20b32f183bc8c35f31' 
  AND token = 'WLGIofW2DU5hoUmxJplQHsdg8Q7Kt6Mq+FxlNFwurTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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