SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ceed77b8d4ca8af9f866f152334dd3e1b8de797930bc001e117111d0eb47169' 
  AND token = 'yjY6uBZuhLfY2Uf/JIEt8gBMVrJAmoIMXZKzVqL52pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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