SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c1544cab52a7a46ea5c0f6749eb6e06b03c3946cd4f781b23d9d916860891e' 
  AND token = '1ZxJqJlAd/BkCgNYGk/xWCDRRQRkq3rn9vSz4glmjjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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