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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4060a32ffb8cd884bea0e3f7cc7e98003a93956512852964b3cde00ab6dd8a99' 
  AND token = 'W8Vnk9yDwMg+X98tAVDbH/xLg94aP6HEHaR58KUWuWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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