SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0549104a4785496212e6d9a6d61e9f306c1ea12b23d65b78fd734dae18e3d6cb' 
  AND token = 'IsggTdg/IpOPIJnRCbKFAKGu4KhRb3YGbV7VxcXSBa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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