SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46533a56ad0ad12b2198d123d747d281fdb1e47f2f7e618d7237e86fc1335eeb' 
  AND token = 'lZKr2jvzgX0CR25Z04nFCu3GcKUdVSL3SJ/QhNd9eLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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