SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd32b86ef10b9883cc31723f9ecd3d9d21ddddd6489764c8fc837eab93765a6' 
  AND token = 'm3vCDNj/V4rHxBiuaFdvrOS/fJZSKy1hqcFvb9DHvHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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