SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f966eb4743c8f108bff935968d056b52b52cf1f737eb2ff9b4ed9b8ce2cc687' 
  AND token = 'oLIktqBYyBNE//gvt8HQGCr7a+Fjfmg7tSQLVcUEtq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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