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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fc3a3f86402368efe683d8fca2b96881809be05c7f180bbd20097c5924c8e5' 
  AND token = 'XKt73vZGXNUyxMsGCGs7ieC8J4L8/oXvgb/TJWD8HoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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