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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c9a02abecaed7577bda72f8a47e067b432b1b04029a467d08cf78bb378976a' 
  AND token = 'aWqHlMI/4HOHjArCCiB9hieuGdBrzDJVp2BAReK+ER8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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