SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b9af1a8bafb08356a545357a404a9db2bd58f2cfdb4e19627b291f1bce370f' 
  AND token = 'ZTS22H+0jtGoVMx8TwUpjxWj9g0q7QDn+CqAuJY5kq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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