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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699caa4dcb596c98d60255d07718a10cfe68aa824e9a374ada212d2d03f399fb' 
  AND token = 'DPDye+vsLQ+PF6PobYnBfU1vXYnfuNeQokU4wl6mAjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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