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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae5b91c8212ca157b888e9db9b0ba1e0cdd02f0c12644803038d3aed0ee6151' 
  AND token = '4d/YtbZkiuvGxmo7agsF6Mjn3BhjHi0/E8qgA/5PN80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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