SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192f1057b6f3c647b7bc2531a56d98438595448c161b4d0ebafb94371c8dfa4b' 
  AND token = '33hZYXDbI5kBjS6AMzh+1JSe+3mpM46QzD9s+qxFs8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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