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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3099e55891cab735fe6551ecfbd16da58f8588c58166724046dc5cfec16b91ad' 
  AND token = '3uVo0GOsTiXu/MqOzB0qCbYUe+ME9NC5Qyd6dP5lIwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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