SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84385077eee59720f1e17480e5b6c7e46e7ac823e1f61a014aaa329f8b9f7ba' 
  AND token = 'sUJoopzH5a88TjPFGCXKgtV9lrQ/yrkV33GCQ5Huq+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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