SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca9098b5f0d55163d2a4faf2b1c1f69afc4fd8b407121e374459832c2d7f7b8' 
  AND token = 'ABhL+bnngijrS8fEOVCXGvQNjG4fkNNQyHm/YgmXUI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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