SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72c766d2affc4e5183ab4582db7f7bae80c74a869fa46b2026729a72e2024d2' 
  AND token = 'Fk1fGEzg+2nFZFjBYQ1lO5zhPzzY/ikTmz/I3sKZPY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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