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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daab68f95dc0aefae2398151d6c5f37af185931e763fc8648369eb3cef91c5e9' 
  AND token = 'wTaXOYhCdW0TQex2R05K0BpSiyUWNzNkE0kWchjCl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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