SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0ca12957b5d4c3b221ff32ebbda388c824f4bf0267d10564a66a3aa1e13f15' 
  AND token = 'XPzsw7rnvjeaf9sJvEit/jKizYQR4bEbGkZf2ZIDnjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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