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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36a8e366f98fb6208271aaab08e7d9204fcc89a955d9b4a3b8fd01ce18a96f7' 
  AND token = 'lMMHJobPrsHmteGZlt9j92e1hr9AWWJVv5euBh9I+nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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