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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ce4ade47f014be982d34a43e88eeb2b81672ea39e2bb4beb87c7f298e374e4' 
  AND token = 'kiq6LCXNXf8jgnU7mHweg9UjPFKOI8336FTLAAk2WqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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