SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1022921f55abb8f9a5a282e3f5162ce65eb8685edd2973f47f6cfc2fc0f6ab30' 
  AND token = 'TmLvpbo9CzDDV2NXZRqYPv1JI//vK98/3ozLtGoLXKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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