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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18479ef03e648e8183100af0b245f49d70ae363aed03b0a087de476f7fb1d0de' 
  AND token = '95c9DmBPqJLU9TF/+8WpR711N/yHkF6xS1RUbzMq76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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