SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e03d79b84c8c878ca8cb47b5c636fef50af60cd6c2552b59e74006842350a4f' 
  AND token = 'hyovqxOPGymCC14eBFdZL/eCjFcLcJOSXsVmKgSL3OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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