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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4feffdb45150234570714098b9825f2547ed4189bb5cd53abe7785c40f34ce05' 
  AND token = 'wZ/+nKaFSllmHrPxb2HX4eMkczKQYTAma+ZBHgSx91o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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