SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d10bbf33486a3e60adb811794f89131370836e19ee4276b96fc23ad4e25434' 
  AND token = 'LEkWl/uuwiEB+bqyWNffgh8YNiVYrJu5x3qXUY7Foiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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