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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08719c5ddb14e408bad89b8a3980387d85d752e1742f67ab60b1578207d26c90' 
  AND token = 'zE9t9dKOf6rkrRRP/B14Gzz/srhaLVxIbFGHuE+H2vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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