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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6defbe996f6ce40916611c2ac15a9ca6a480be00ec0784fdcadb4dd03ec1212f' 
  AND token = 'rl8PPFwghnYcrZxw+6Qjk+9yd8n6wj7op9szg7r0GJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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