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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3228c7e7be394212d7db491544f3c1be476bf55116b19c194fdf09de7d504405' 
  AND token = '3O6ds+sG2ymklig9n7wp3ZdFyKh/6VRsFwA5Ff+jJDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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