SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7334916338da2788ed476d2f14d47fadf7309089181494d2cb74ae0fcfa73b' 
  AND token = 'qyoZh+DZK5D4oF7HUPW0xBZZKVuX0bMxuj5mMBfKqug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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