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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b447b601052d1a042447258a617db54a363d181303d22ddce1bb52a130e1204' 
  AND token = 'XhffEistfc6L+cm8UM/MHy7KNqcz0ZJTa5aedYHIHmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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