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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8adef11e9989633b09dcd89137fa89c760ad24437c46c8cb084fd337645de0' 
  AND token = 'l82W5zPnQ0hf/yP6OGg51eebQ9JIbmVwn68ySpZpYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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