SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02abde36b4fc55791b9a9f3e206040405517d7634d338d7fd3fb587fd1175b84' 
  AND token = 'nXVupHoxO1/qJVh/Y14sIm9ZiS1Xhh2tjlA9XcGtWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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