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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b779d1629e3f6f6019662afc68689184823104f5f900f313baf9ed0ee57e82' 
  AND token = 'kebiM/+QYyewMWrPjk836E8uwf24RNe2qwHY86hJkR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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