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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1322ee37cc5342192052ed4e1eba4b7d5fc5500e6d63c7877fb8c8737d18d3c' 
  AND token = 'IVMaMj0GnXQS1x0GBW92GOdTplUEJGtw8eL36UOwa8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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