SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a1627d1e74a5cdc63238fb22452d4fe80b27c6778f156fbdd18d4b724594b4' 
  AND token = 'cXT9HWVTRZIHrnjQizIgrG4v1jaV7iqUpahlEDZyiK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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