SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0405f03f87ae65c95cb90dd801eae3093b6a59805ed0c230b78405ad67839d' 
  AND token = '8wZLI3VAcDXMjQyxv9tJrhggr/CLry6IvKkV//B/LqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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