Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fbdb8038497aacc83436446db805daf12d2f7fc739ecb1d09c208bc95503389' 
  AND token = 'JQOsBe+jeskrUXjpvNslOdixmTfdsZDDgfwKuh7y3Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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