SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07cd1bdccfead8e19f79017a68d514ec63d17b2ab229ef72a88061e5c99bf1d9' 
  AND token = '2f8TXJvZoybQYIh9wfvvm7F3hEFmjqNlpzkGSKEXHhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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