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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0673e8bd0b40bd178d7b68ac7b96593f170740e56ecdc7fe23dbc76dec55e1ba' 
  AND token = 'vYxmAxMgaIt+75jxyDTxQ2UN9UIBi+HWOD7zIExI150=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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