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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1773845c9c672dc93020df3c8d5fcb1ef7c361957097f59953aac07607bc3d' 
  AND token = 'oJ66TpHlYGMnYl4iRbmlhis/od9cdgkNNlWs87lBAIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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