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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa574a720388aa9584d8511ac7225a12298726938ddb6e6f7a11d13a99cd7f6b' 
  AND token = 'xeoF/lneDlQNOs0cd8EMuOMR3CA9set9x9753RP7XMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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