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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761e8f39bd00e726845a590cc1d8e973c3dcacf218f6b7384fc5acdc44122d00' 
  AND token = 'hbdpQBodoscBlt6WSbgQFjZQKDFjxBTOguN+Wj4H6lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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