SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ad9fef848668d8e73f1543018b67c7446de07ac89e65ad0529bc51d9b9ee7f' 
  AND token = 'gQKOq9AgivdX06xJX+BwTq0BG89sFFKhlzvH8FWVop0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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