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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4452c42107527820ff6d7b31234d21fb50a301c782de4b9f343d270c674413' 
  AND token = 'UIWkrZiNpgbHjXIav3Q1d7Xc9pFjCzGoLAcU+uTVCVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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