SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1316af0e26b77ec91de6648145174a7660017a6c26b24fca2e4314b4fd7638f' 
  AND token = 'fjbmR/h/DrC/jC3xIBtaaDVMvJLQIiQuGEqpf6v8K/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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