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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05db8bfd35f1ecd70734ec999694b3ae37eee74e084243f63d22f3e3e1f3e758' 
  AND token = 'A7sdGLXvv3MYknl8ldkqXeYbqh5zieYrfwzyGeEb8uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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