SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edc4eab9f3450d6306c0eed16ed70022c7e7816f67f533a650365b29e64dc01' 
  AND token = 'vJnMIwkPjRGCzanqBpIH9Z+3dxKT+8TmgNDoZmNJltU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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