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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babfe7d1865eb805043acb7c6fc77c77ce7f7818b25ac970bb0ed3b030bb96f0' 
  AND token = 'rhCoSYIiqLbvRGbk2Wf6kie7iq9AL23Rf7yHw6BRoLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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