SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f31ac1b05e64d5f49d58986ec0fb6c6179122b52f0f85650cef23dda86d814e' 
  AND token = 'mTE7IwbZJgKIyapO9e6bItsSuGl8sJrTYlXX/z2/Zzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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