SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd672961f02c5eef4c556aee5372d3fb5f923879b446e069197bdafd15b0bb2' 
  AND token = '1GrA/5wjFjvlhk2IDpwxutTV+aVR6jCWOFAyR8PuoZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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