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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03e272637dbb5fcc5fc9ba6853d2b34cd4358704a12b56b9102bdeab1a61ad0' 
  AND token = 'u8u8247bu7uAEppjVYtIgHDOdX/yVUWn/HqaYpYNrjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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