SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb109a33b7a8a4cd8d379cd953dd7899ec669d35c61009a63d6583e3dc5338d6' 
  AND token = 'QizlcbbI1m4q+y/cizgTNy2pKJnj60xso/OtY1T9ons=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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