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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d51ca16b4fd7f1ebe9a8ede1a2f4975b87202d774721a04c229f2cd155b95d' 
  AND token = '9r3hWNM02b8CeCo1/j7I9cMhffW9c7Kfnr+JLDrdSzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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