SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c384ba74402ce4711463cfa3614d04bb5685f1ab27976edf62592bc1311a692' 
  AND token = 'wG2eFJ5pP/Odn2HnqnZlukEJptPoFC+im/7ojJFo98U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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