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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3954f56b6b335000933c82cee9edacf0be4a83544c0bba5f3e1b1142e259a7' 
  AND token = 'MAklD/tNw69/JLCNfrdXAPmEN0KmavrnMpmtQNE9UuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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