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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d165e6595014db316e8d2272c56d9f85ae1d5f0a29f12812e36eb8f4bd3d759' 
  AND token = 'OznWe5VEDp57My9LJGJNp5nFNVAKQVcPKuJoTYJwQtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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