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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb53cf85f0d247deaa06b107857a7bc4af8b4f483ffe0e9aa573b69e0d663f7a' 
  AND token = 'hbd8Gtk5G7wyTOCYUt0iHFxdT0IgTCtMsdcUbMFyagI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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