SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46abcf7849aa501fa716b3a372e73fcecd2c193f3922bb6098a908ce7f834b2' 
  AND token = '2Te4JBZY8292gQaTVp/DSMdKZkVFoTwPDU0kvAGpjzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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