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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6ca1bfa4240aa4920463d177e33bf4e0a472d22ab0442e08ae00f42e81f0d5' 
  AND token = '3CB8f25wLJT5HOgWRCMNovnNaTVk6h2WHTWpol2tvuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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