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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df2b86839154e36f36afa664bba2809e66f8bee598a54cfab6f0d225d5c790b' 
  AND token = 'fVwv9t2kY8HADqTTZsXoZnrUtrjUe4v8mUeupl7qIDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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