SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e59196bb3ae5fc868bdb94fb28b51fa3dd7f2380fc92ccd4b71d5d58e0a380' 
  AND token = '/+9TRbYOuzf6ghCtfik7PGV3HKRjqk4NmF/cc2FKtKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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