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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88045670e689215f800599be839b90d7a81863b923389d8c9f771189b23a6e77' 
  AND token = 'jbp6SGvd9REOwpY4xSrB5AuuTa1HfwEVEqB8JLsI7Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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