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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c650a8807c76c9d4be921a29fd0212ae20e55f7e2506040ed650deef3c93bd' 
  AND token = 'Nh+PE4aFgE1gxDptWPsqM68gQ8e0RzGWdrMbanxVA/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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