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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92407ef987548ac47af709f0882d513e67fc2045e682734fdf30e44ad5b472d1' 
  AND token = 'a5MP+Z+8ZEH0dMRU75l0Pw8yfvVKRMOe6yxuSfupj9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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