SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317419a6235b3990bdf8200695fa5f32d83ed0647f8f1668626b5f1e54f0bced' 
  AND token = 'xFQmx62gCE7GrxpWKqzGCTUC0p4Nqm04iJNILlYOVtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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