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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b79f7be01da8a73a0dbb2eccda7f9d7fffc356a04488a2e76cae16adeff389' 
  AND token = 'qGKxYGG2+u6LlDlMoj6CXCAMcrYuwuHSWa6ZsYPZxoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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