Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81db18b0dd8133138921d17cc96b12531617fed2f58ccf9e073389652a5fa21' 
  AND token = 'CiVmYy0VRXYP5rW9+4N2IM8x017v5p6DJ3e3NyQglg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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