SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7941fe5ee7fb9bf0abb4b3ea6a02628e3338936dce7d500fce43b9979171d23e' 
  AND token = 'h3PuCZxK3A4EqgjgHEnGnYnlvLVk08L2HRzOWNBjlNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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