SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b8e2483ac3709fb5bdb8cc18540943ba854bd7c316f56de85e97b9873cd429' 
  AND token = '9sH5S+kkj/XBCcTl5+Jlu0BL+wz2umd6utZPqf3Air8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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