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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59bfd47c1d9f9ab597dff845d4f35a60c339b04ad9cad9ab296d1a7f45fe72f' 
  AND token = 'Hv5Jf0EhCat8ypmaoD6z+iXkG2H9wLzyPruIYoB/ZAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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