SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630f1fcbd75148b6483c6515a95f2afb18c141879a2824d08fbaaf92f54edd99' 
  AND token = 'Kz3I662KIiqt8JoBYBMsyYhx2HLI/NvVovKws61VBA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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