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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5495542054a8182179b464e8bb146303fb40904a2ea0c5a694b49a1ca70eb8' 
  AND token = 'jxE0z6X839BbApSKl3OEYlNd/e5PydGEFna3+sta6cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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