SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcd8676b882e2d51d5fbbff0c298a9513c91be5447d939bab48acc4ee0e9732' 
  AND token = 'rwyuyMuCHwIv1VxrGsZ/JjDfno+hPht9JRvJH0c3eMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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