SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42564160483ec8c165092634e7ab415808fa5e24eb5f39c3bb2868163e21d7dd' 
  AND token = 'dImVlwzXlWDckKF1gznov4Jjam6hMJH+oG3KN74L+Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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