SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc25cb82f6f81d72563d5f0c65c31ff6ce6ca35907cdcbdf1bf82730e237bab1' 
  AND token = 'LmD2JZ5OGLwRX5YPFDZmPSwTdxgDDy4h4zluzd/YXtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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