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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4d8d12d5f3d8f7cca4c9c6104c76c8b9166959261cee928e3e6be880dcf6fc' 
  AND token = 'Ii360kKMMz8j3jfW/goDrxVOQBshLIgPZDi61GFBr4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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