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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48d83717e9b63e40076f1f58805e9dd95b168517d8aab93b6a53905af00899f' 
  AND token = 'y2DgeKcpd0HBN/AE7IytZq6hVsJoDOHPNZYVnYXqkEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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