SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bf44538bc3fa93925a83a8772a4dd12271f77be088604e97e3ea88b39e12d1' 
  AND token = '48omVIzLopoNVzEnzxK/n5QGhM6DEvFh/wSypiJWRk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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