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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a90595e3e47a529c6d9bf23f54b773a5374f124d4e3c2648e1a57721adb9ab' 
  AND token = 'GMbl2AEfSl1JlocL/WEktShJKXubm4S02q2HGZOSeJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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