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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bcdf0ded88a66304e8c145c005c1d6bbce5fba5a24601e60a787f9aeb2efdca' 
  AND token = '78aolpyo8w/1cze6iKsv2+zH2x5pgw7Z25xY08fzqL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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