SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f233dba340fb4281158784fe98c74ae76404d9f78611a6b11c586897942f30' 
  AND token = 'hzzb9wbSLdD++/5romgZCsnK5j+5B4YnpdGBcUe6VOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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