SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb109f24a6fe6b769af5a1d52ea6a121a8f66c4b63608cab16d29448175752a' 
  AND token = 'ZXClwpElgkJViDWQi/6Z59dSh+HXvqHFxQOz92qy7Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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