SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f1be82ec902ce7bcbc1f0d54dfc7693cc8fec70d0016fc1bd0d90941775686' 
  AND token = 'Ue0oG+Y/+t339J6WVhZs9RJ4rwUYUvjzu1ovpViSKH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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