SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbaf2959bdb942b8a87c139fcf12bf557830de95cf08a59d0411c9a485533e3' 
  AND token = 'oS0hn7G8qJoFGzI11J7SsySzBVF+Ivl96jr6kVhgwaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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