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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38904317a321aa26e094ca9529fd3219a190379a2f0c2e931e5719d597417ee5' 
  AND token = '7E6arAngphAqzgh4DXv3fyxIsBh0nOrN+ORGqLX+sI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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