SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a85caf511f28b4b723011363f4832743d61f81c3f5c56156a116b91441f5dd4' 
  AND token = 'yJTwLtNhNFjuWUg1I4rHLl4/y+YPYSIu/Kq9UPLgB1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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