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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1f08c5a0ee21e9cf88348cd035c6026ce8896a298b34498176c843db6b1b53' 
  AND token = 'lrZMh6cLgB01YUSgWx/3AlFud/Yt3f7s6buk4R6azD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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