SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24170842753cc995800198d921679f29d06a4f0e6e77c253e2fe31e7d9945a22' 
  AND token = 'tghCh9cn8uFO1mNTEqmJrqABZwA0NLhYKTvgbxw4Ejo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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