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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06eb7b8a9991eb0510cdc3ca7018d81efb0a9cda03a1ec15457a892e512e5407' 
  AND token = '5JAPc6BpsMgdxHeB/or5LC/qGw01s3k4I/WePRiexKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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