SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e2be941d979518c82ea2c8603493ee2412c79920bef9a4161b7f47b5130c76' 
  AND token = 'kJdyA8jSArIkZ3Eb+J+60KBzDjvwHgEZNPJcvqZsIAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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