SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2458d2575dd464fb8835b33af09516605736f8ce0b659dfba4b1e79fa9768a8' 
  AND token = 'RpCPEdZB72WFGU9686naD+HpKQv+WPSgok7f5wzCHKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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