SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41151bc86e9441b9154d78a59381bb8a3bbad24e76bc79f1b4a61c14438bdf5' 
  AND token = 'ZpFfwvUC/CmKv8zQzd4cb3yK1BhODhTpRQU+Csfok7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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