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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbfb86d203726f41126aec1ebba83b97a4b7f906655be9ea2867a2494588407' 
  AND token = 'kRxGN+NgyBxVKihDWCSSamoi/uanvkTH3QnYX83NhT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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