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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ed0bf039e94a18e05d931c5e46790e8e7f1a833624e05a94274455b8ead17ee' 
  AND token = '92FK1am1gDM6eR3EIbuuwk0JU5Zu58Ca3nAsg1YQle8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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