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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092682dc0970cee84c08c114a6ed76f7adf8816ab247a8b6ee20bc87e31f4ec9' 
  AND token = 'b3EV8pyTgtDpQy46Lf3LQ7zuSh3LHA4pQtlF4dWtfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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