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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b955ea3a8693b77a220d4c58a5f4ba25f567a99c50a663c57f210fef5d1ed360' 
  AND token = 'NQBk76BqOTyIKMm++xkGl1jQSOckMxt2qXJHS4+jGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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