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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8a15768f83753d5b94bb1c0ef172cdf1ed16659b58d16e8b9ba4903b7c9980' 
  AND token = '2VlwlAyW7bSXoPbwHlFX1WU5UXKQvDgF8Tcp0hDph48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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