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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36ae76f8e79237c1cf169e6b349d5e5785db855261c7cfa6b74d005c203ebce' 
  AND token = '2bN/jRiUOXKo/+34N77+2BuajVh8YdIXtknQJcUwB8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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