SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2689fd5503d6331f391ca8d681ff70e8a13f4e2bc4dff7df3134c768c56ba5' 
  AND token = 'rHyuRxuGUnz/QQlinDKRi1aJMItP4LYEzNpO/jmDmow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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