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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b0e29ca63d59cc5d162e63ac102315993180d7a07af54f136aea23bd85f115' 
  AND token = '6GVW0mROVVvlcAAr7Y4yallPn0w9rlGMjUqwyxneB6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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