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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ce10ccdfc90a23efa0f5afadfa76dc9690f37b1c0c5584ab1e4dc12ab9d2bf' 
  AND token = 'KtQZ02vmJBkBwPBjBWkf5yNwQ177/4X1lYEbywE0kWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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