SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6258126ddeb7fa82b1490aee7c0afb8c66d626e79bc07582fc029f513bce8ee9' 
  AND token = 'xikuWcIWPcIShwjYqs/g5MJw5OFU4IKfeKGwvXAf+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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