SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fe9773581f057c8d5e6e9189c9298fdd962365285d9cf42c5f7c30888da3db' 
  AND token = 'VriVBAQqtC/y/EN7ZVLY2RBBs6KrUWLzKJYgF0xecNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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