SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b234df12e13d631df7fea16bc3f2927c0bf93e10d5fc2939567e6d34d6ad39e1' 
  AND token = 'wjSKj0vzhDw1rHSdQ+zpc+7xWh2aICi+LNTqBYJlX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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