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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da745f50376e8865703ff0651e9cdc6ae3eb514defc8384b1e39c8eae507fca' 
  AND token = 'vi0YtD8HROl3d21GRoVN8XWSTxXHoh15ghW6jOz8M1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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