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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33ca84442b7b5db0d8d0c78999399627cec568cf70abd67624fc01ce30f8ea2' 
  AND token = 'G9/b8Va9hgUHmLw2tlIaury2VH1C41g7qUrcJbw23wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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