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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b39124abb678830506acf94a8de1acb7d7ae486afa5fdfcd96c3b30d9e6159' 
  AND token = 'TYL6r8FpiShyHtsuZJff6JPyBk9VUs18WLotWqW2MDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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