SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b931e68866051217b1fcdbccb8ded54e4313cd39ac9ae402a707f63a677120' 
  AND token = 'eFPsmlZ6aN/Pdfblhgz8/wsw88RqV5jbHGLytJJ52Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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