SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9827b39f64d1c0cd8e3cd641d3b846dab4197bf8c7d306fb54b5ae345c815452' 
  AND token = 'l2aOHnXMUXCYOrW4DX9Hu0BqV2+mQk2wQvI43r6Z3VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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