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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30aa008a81d6fef629d6a7236e3b72c754739c1a18add0d206a90598421f69ee' 
  AND token = 'xyWnMEdNYx8St31AjeN33QRMd/0Y6tgfw4PPTvfAmO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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