SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d86e485114b3a2786d4d6406ee5ad580abf3effe058639a4b9579779d2ceb5e' 
  AND token = 'yHWv+hFf9C0SjwGcDo45/dJaYm1BVuk9wr7HynhoUNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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