SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d53667cd06dffaabe04efc5ce49d623aa36accdd13eb96c51a0922122ffaa8' 
  AND token = 'LvKtb4aNRu6pY+gWFaUN+gIKinuONwr7QKQM6bPdgUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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