SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a35ae7e3d33b044fe1492443c849f2e065d29db80695657fed8d35f9551404f' 
  AND token = 'mvfWufvCh+75eOplyF/pNQ+YQ+IBXhrKXmEUjwKawNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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