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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61019410eeff7bab29cf72d60e94b6ec3c8c263ad1dc5c2d9b9092ae00a10a15' 
  AND token = 'KGTx9cvF6P45ZDKlIEuiwtQKPlE9m8eAAmualNBteWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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