Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557a8a1330a508035c0fc243456f9ac87862af243cffb357b617a33b222b47a9' 
  AND token = 'cUD2d8W/6TGn+V4TINIHQmnXYqsEBIxhHuE7srKPD8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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