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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818b75e592af04839aedca05d0b17608b17b99d173e55b2daf667e769a6eaa02' 
  AND token = 'WF9lqi7D46zG8f2KBdqKH3WPkLIMr80rT0jASDxOs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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