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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af24a4ce9cfe1ed888b8801a289124f87bbde6ca952dc5daff49f99ee9af882' 
  AND token = '85B4myAmWo+xPkw2lASw2ebHxXc0sKt5g6jsTp4Vevk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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