SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a9b42fa618b74f5705680a43ed88c6f91a058233976a8fb9415eb068e394d5' 
  AND token = 'zBrnMNyiaYgJ3yjCfN+SjCz2KKS4wqXWblx/zKnrnoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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