SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22463f9652560136e17baf3ff13bee896c1f74ef88f7a942e639947994f93cd' 
  AND token = '/mVZeNcC7hKwxxl5xgY51r6qeGVuVqYIX9dgQ1lVBzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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