SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37562aca467da1b4f038bbb4897715f286c2b4f565123d86f6db62fa7dc887d3' 
  AND token = 'LLDaoHmQZwum2JlZZLsenm5XQWg/WXqZb3aC+p6+yCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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