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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669cbf697220c32e466f713394f46d273a7f7ec3da5a6abedf0d3ed9ddf807dc' 
  AND token = 'xlnzrgzVIYB9s+DQg5c9W880y67AxxyDcH9rrRQdpis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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