SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a954d462025e84aa1e53db4c0fc57aa227c03607ebbe17440cef7d29fd9e5fd9' 
  AND token = 'G0WaUBtN2qAvuDFo/2R/7PgazV2+6GZAwlIVe/hvq1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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