Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0f4f20beced561aafe7f442470d15e4383ab15d40008dd54fcd9d18bb3a044' 
  AND token = 'p8rX+qCHhkZPPIfAqU0VCEVF5IyC6bSyVhYrbh3caQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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