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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283f51c0b8f4c7fc509f1a648c64cddd95ca0e6c0688b62b9e75fb58dc5f2e25' 
  AND token = 'hZmiNYJfcozV5X6TsQLbRkdk/VkP6H71aGphW/lLTwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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