SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054267033bb939e8f1e6dfb6cec5a49a4efe69345f01bb0a6cc5529ab7a5e879' 
  AND token = 'koQ8gkA+7XGvI55J2gjj53opAV5gIYljqZw6FuN2VNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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