SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f07d27732b54337977841c820c7dfd17fa8f4dfe5758e1f21857f5ebc953df' 
  AND token = 'mIZvxxfJtnBZR4odYo/UpPRLxNhGzb0Jyj8cbP1P6Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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