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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6559291c50faad7490d9241710c0da0a4a36d89294c1a0532eb75ae3d76798cf' 
  AND token = 'SCC9d6qn43JbqGW1qnmxNwAj8vpUilYJ8szSez26R9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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