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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4932083bca26b909d0776ea151807437397d5814e26ff35c445e9aed33373236' 
  AND token = 'Q5GObmEgBb5sJSE7aOfIVS8TGvN6cWRMjxxydJyxW84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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