SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e96b97a43f57ba011446a22ea7fcf82fbb0eb89f909c4d9a9a4767e43d3e78e' 
  AND token = '1QK9uswgnziKN+DUJTYUxubMlhvZTbaBSNwcLKVlXNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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