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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8ce6e3b6a2686b75f7f4d33bf89e92db60f9834c8ee6bf55a75f396c10aacc' 
  AND token = 'h1EttXj+sH0nnZU02aOVzkLzXVc25aucbtq1756IspQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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