SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b0487fe51e8679aeaa49730086b7c4a35b08524a380fa10aefc7613ae5ddf2' 
  AND token = 'uzvpivFniKkdYHMKFEBhXg4W+R7ggjRo/imyrAOKP7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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