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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa666faa41a5fa6aa7f0023990bb8c716564a9fe72db41d58adce1c4295f5f8' 
  AND token = 'ilhXe9E7PkIzsBsu3L1jLa5EqtUW89EsZYWky9wG1xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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