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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62f6a7bf8240a37fe441dd3ad2975b9c3d0d6ca11acb3b8c49e727606de2dca' 
  AND token = 'V8FPOjycodQQ0MlaTvj4QXl4ga5nbtW5Y4T+uwVzg5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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