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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35dce21af1c11db9838e1c53694b8cbaae18a49e9869cbb3df7bb0fe91c3c8d' 
  AND token = 'YSij7yAytL0/7HsWeuahtFkyEQ9GuPV5UWuhyIdWX/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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