SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0545674f583cfc2982ca3ea72c6d5a0e289827a664060d6e5030715ab7b4abd' 
  AND token = 'Q3TsyXJeu/jVrwImFj/kXMeW3xPgxAYqiuOIZHtGtIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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