SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7cfa255220b2fdffc76494882a532dee4d8bc4bbb8fa34a67461f16028b025' 
  AND token = 'l9MZyK5jlaah9L8lRpBTUsGdolm45ODz0VJO6fqDF/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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